CN108880646A

CN108880646A - A kind of method and device of determining transmission time delay difference

Info

Publication number: CN108880646A
Application number: CN201710330776.3A
Authority: CN
Inventors: 钱锋; 楼群芳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-05-11
Filing date: 2017-05-11
Publication date: 2018-11-23

Abstract

The embodiment of the invention discloses a kind of method and devices of determining transmission time delay difference, are related to the communications field, realize the transmission time delay difference in determining communications.Concrete scheme is：Target BS uses uplink time delay measuring technique, the uplink delay, τ of acquisition UE to the target BS_UL；Target BS obtains τ_ULWith the uplink delay, τ of UE to Reference BTS '_ULUplink delay inequality Δ t_UL；Target BS obtains the difference DELTA t of itself and the uplink and downlink channel time delay difference of Reference BTS_Re；The Δ t that target BS will be previously obtained_ULWith Δ t_ReIt is added, obtains downlink transfer delay inequality Δ t of the UE to target BS and UE to Reference BTS_DL.The embodiment of the present invention is for determining transmission time delay difference.

Description

A kind of method and device of determining transmission time delay difference

Technical field

This application involves the communications field more particularly to a kind of method and devices of determining transmission time delay difference.

Background technique

Demand of the modern radio communication service to network capacity and communication performance is constantly increasing always, therefore, in length Multiple-input and multiple-output (Multiple Input is proposed in phase evolution (Long Term Evolution, LTE) system Multiple Output, MIMO) technology, the efficiency of used bandwidth is improved using space multiplexing technique.And from evolution Rel-11 version third generation partner program (the 3rd Generation of LTE (LTE-Advanced, LTE-A) Partnership Project, i.e. 3GPP) tissue begins to introduce downlink (Downlink, DL) cooperative multipoint transmission (Coordinated Multi-Point, CoMP) function, it is intended to be covered by the cooperation of minizone with promoting high speed data transfer Lid, ceU edge rate and system Mean Speed.

A kind of DL CoMP technology is relevant joint transmission (Joint Transmit, JT) scheme, and the program passes through multiple The business datum of user is shared between base station and carries out joint transmission, is combined between the base station of transmission using united wave beam forming.Connection It closes to send and not only can convert useful signal for interference, can also obtain higher wave beam by united wave beam forming and assign Shape gain.When realizing relevant JT, user equipment (User Equipment, UE) progress base station is first passed through between UE and combines letter Road measurement, then from UE to base station feedback measurement result, joint transmission is carried out according to measurement result for base station.

As shown in Figure 1, between UE, there are transmission time delay difference, transmission time delay difference packets for different base stations in transmission process Include poor (the down going channel delay inequality τ of two base stations as shown in figure 1 of channel time delay on the channel of base station_Tx1-τ_Tx2) and transmission path on The path delay of time poor (the downlink path delay inequality τ of two base stations as shown in figure 1_Path1-τ_Path2, by τ in Fig. 1_Path1It is illustrated as τ_P1, will τ_Path2It is illustrated as τ_P2).From the transformational relation of time-domain signal and frequency-region signal it can be concluded that, existing transmission time delay difference τ_iIt will be final The channel system H (k) for being embodied in estimation attached phase rotation

Currently, for transmission time delay difference, there is no a kind of good estimation schemes, and the channel for disregarding transmission time delay difference is surveyed Amount mode will lead to channel measurement inaccuracy, and then influence the reliability of communication system.Therefore, when how to determine transmission Prolonging difference becomes urgent problem to be solved in communications.

Summary of the invention

The embodiment of the present application provides a kind of method and device of determining transmission time delay difference, realizes in determining communications Transmission time delay difference.

In order to achieve the above objectives, the embodiment of the present application adopts the following technical scheme that：

In a first aspect, a kind of method of determining transmission time delay difference is provided, the target applied to joint transmission in communication system Base station, the target BS are any one base station at least two base stations of joint transmission in addition to Reference BTS, Reference BTS Any of at least two base stations for joint transmission base station.The method of the determination transmission time delay difference can specifically include：Target Base station first uses uplink time delay measuring technique, the uplink delay, τ of acquisition UE to the target BS_UL, τ_ULFor target BS Data feedback channel delay, τ_RxWith the path delay of time τ of UE to the target BS_PathSum, the UE be joint transmission at least two base stations Any one UE of joint transmission；Then, target BS obtains τ_ULWith the uplink delay, τ of UE to Reference BTS '_ULUplink Transmission time delay difference Δ t_UL；The target BS obtains the difference DELTA t of itself and the uplink and downlink channel time delay difference of Reference BTS again_Re, one The uplink and downlink channel time delay difference of base station is the down going channel delay, τ of the base station_TxSubtract data feedback channel delay, τ_Rx；Finally, the target The Δ t that base station will be previously obtained_ULWith Δ t_ReIt is added, obtains downlink transfer of the UE to the target BS and the UE to Reference BTS Delay inequality Δ t_DL。

This application provides a kind of method of determining transmission time delay difference, this method is from the angle of base station to the every of joint transmission One UE determines transmission time delay difference, and obtained transmission time delay difference is the data of user class, ensure that determining transmission time delay difference Precision.Further, the transmission time delay difference of high accurancy and precision will also guarantee any mistake that transmission time delay difference is utilized in communication system Journey all has high precision, and then ensure that the accuracy of communication.

It with reference to first aspect, in one possible implementation, will be using the determination propagation delay time of first aspect description The downlink transfer delay inequality that the method for difference obtains, during being applied to joint transmission, for correcting downlink transfer delay inequality pair The interference of joint transmission process, to improve the accuracy of joint transmission.Specifically, in target BS by Δ t_ULWith Δ t_ReIt is added, Obtain downlink transfer delay inequality Δ t of the UE to the target BS and UE to Reference BTS_DLLater, then carry out target BS and UE it Between joint transmission, be corrected during the joint transmission, specific joint transmission correction course be first progress channel survey Amount carries out data transmission again.Channel measurement process includes：After target BS sends compensation linear phase to the UE on sub-carrierk Pilot frequency sequenceFor carrying out channel measurement；Wherein, r (k) is preset target base in channel measurement pilot frequency It stands corresponding pilot frequency sequence on sub-carrierk；K is the positive integer more than or equal to 0；Target BS receives being somebody's turn to do for UE transmission again Target BS then completes the process of channel measurement in subcarrier k wave beam forming vector w (k).Later, carry out data transmission having Body includes：The target BS sends compensated data to the UE on sub-carrierkS (k) is target base It stands on sub-carrierk to the traffic sequence to be sent of UE, w ' is that the port port of target BS transmission s (k) in w (k) is corresponding Element.

Optionally, the pre-coding matrix instruction (Precoding that w (k) or UE are fed back to the target BS Matrix Indicators, PMI).

With reference to first aspect or any of the above-described kind of possible implementation, in one possible implementation, the application A kind of acquisition τ is provided_ULWith τ '_ULUplink delay inequality Δ t_ULSpecific implementation, may include：Target BS by with base Quasi- base station interaction obtains the τ ' that Reference BTS is obtained using the measurement of uplink time delay measuring technique_UL；Then target BS calculates τ_UL Subtract τ '_UL, obtain Δ t_UL.In this implementation, Δ t is calculated by target BS_UL, saved network transmission resource.

With reference to first aspect or any of the above-described kind of possible implementation, in one possible implementation, the application A kind of acquisition τ is provided_ULWith τ '_ULUplink delay inequality Δ t_ULSpecific implementation, may include：Target BS is to centromere Point feeds back the τ_UL, at least two base stations connection of central node and joint transmission；Target BS is interacted with central node, is obtained The Δ t that central node calculates_UL.In this implementation, Δ t is calculated by the central node managed concentratedly_ULAfter be supplied to target base It stands, has saved the process resource of target BS.

With reference to first aspect or any of the above-described kind of possible implementation, in one possible implementation, the application A kind of acquisition τ is provided_ULWith τ '_ULUplink delay inequality Δ t_ULSpecific implementation, may include：Target BS is to benchmark base Feedback of standing τ_UL；Δ t is calculated by Reference BTS_UL, target BS with Reference BTS by interacting, the Δ of acquisition Reference BTS calculating t_UL.In this implementation, Δ t is calculated by Reference BTS_ULAfter feed back to target BS, determine the two for target BS Between transmission time delay difference, saved the process resource of target BS.

With reference to first aspect or any of the above-described kind of possible implementation provides one in one possible implementation Kind target BS obtains the difference DELTA t of the uplink and downlink channel time delay difference of the target BS and Reference BTS_ReSpecific implementation, can be with Including：Therefrom radio-frequency information reads itself uplink and downlink channel time delay difference τ to target BS_Tx-τ_Rx；Target BS and Reference BTS Interaction, obtains the uplink and downlink channel time delay difference τ ' of Reference BTS_Tx-τ′_Rx；Target BS calculates Δ t_Re=(τ_Tx-τ_Rx)-(τ′_Tx- τ′_Rx).Due to each base station row of channels up and down delay inequality mainly by devices various on middle radio-frequency channel (such as amplifier, filtering Device, duplexer etc.) it introduces, the delay character of these devices is relatively stable under stable environment, can be by the uplink and downlink of base station In being used as after the time delay difference measurements in channel radio frequency product parameters save for calculate use, by the product parameters of preservation become in penetrate Frequency information.So, by directly reading, so that calculating Δ t_ReQuickly and easily, so that determining the mistake of transmission time delay difference Journey is quick and easy.

With reference to first aspect or any of the above-described kind of possible implementation provides one in one possible implementation Kind target BS obtains the difference DELTA t of the uplink and downlink channel time delay difference of the target BS and Reference BTS_ReSpecific implementation, can be with Including：Therefrom radio-frequency information reads itself uplink and downlink channel time delay difference τ to target BS_Tx-τ_Rx；Target BS is to the center stage Feed back τ_Tx-τ_Rx；Then, target BS is interacted with central node, obtains the Δ t that central node calculates_Re=(τ_Tx-τ_Rx)-(τ′_Tx- τ′_Rx).So, by directly reading, so that calculating Δ t_ReQuickly and easily, so that determining the process of transmission time delay difference Quickly and easily；And it is calculated by central node, has saved the process resource of target BS.

With reference to first aspect or any of the above-described kind of possible implementation provides one in one possible implementation Kind target BS obtains the difference DELTA t of the uplink and downlink channel time delay difference of the target BS and Reference BTS_ReSpecific implementation, can be with Including：Target BS sends the first reciprocity measuring signal to Reference BTS, obtains the target BS for Reference BTS measurement and arrives The delay, τ of Reference BTS_1to2；Target BS receives the second reciprocity measuring signal that Reference BTS is sent, and measurement obtains benchmark base It stands to the delay, τ of the target BS_2to1；Therefrom radio-frequency information reads the target BS actual uplink channel time delay and Measurement channel The difference DELTA τ of time delay_Rx, receive the actual uplink channel time delay for the Reference BTS that Reference BTS is sent and the difference of Measurement channel time delay It is worth Δ τ '_Rx；Calculate Δ t_Re=(τ_1to2-τ_2to1)-(Δτ_Rx-Δτ′_Rx).Wherein, the system for different frequencies being in for uplink and downlink, Time delay between base station extends to when being the space between the down going channel time delay for sending reciprocity measuring signal, base station receives reciprocity measurement letter Number base station out-hole run channel time delay.It sends and receives frequency point in reciprocity measurement process to be different, therefore, for upper The system that downlink is in different frequencies, out-hole run channel time delay and actual uplink channel time delay differ, and exist between the two true Fixed relationship, the difference of the two, which can measure, to be obtained being stored in middle radio-frequency information.So, two bases measured according to reciprocity The difference of time delay, out-hole run channel time delay and actual uplink channel time delay between standing, can be obtained Δ t_Re=(τ_Tx-τ_Rx)- (τ′_Tx-τ′_Rx).In this implementation, Δ t is obtained by reciprocity measurement_Re, improve Δ t_ReReal-time accuracy.

With reference to first aspect or any of the above-described kind of possible implementation provides one in one possible implementation Kind target BS obtains the difference DELTA t of the uplink and downlink channel time delay difference of the target BS and Reference BTS_ReSpecific implementation, can be with Including：Target BS sends the first reciprocity measuring signal to Reference BTS, obtains the target BS for Reference BTS measurement and arrives The delay, τ of Reference BTS_BtoA；Target BS receives the second reciprocity measuring signal that Reference BTS is sent, and measurement obtains benchmark base It stands to the delay, τ of the target BS_AtoB；Calculate Δ t_Re=τ_BtoA-τ_AtoB.Wherein, the system with frequency, base are in for uplink and downlink Time delay between standing extends to when being the space between the down going channel time delay for sending reciprocity measuring signal, base station receives reciprocity measuring signal Base station uplink physical channel time delay.So, according to the time delay between two base stations of reciprocity measurement, out-hole run channel Δ t can be obtained in the difference of time delay and actual uplink channel time delay_Re=(τ_Tx-τ_Rx)-(τ′_Tx-τ′_Rx).In the implementation In, Δ t is obtained by reciprocity measurement_Re, improve Δ t_ReReal-time accuracy.

Second aspect provides a kind of data transmission method, be applied to target BS, the target BS be joint transmission extremely Any one base station in few two base stations in addition to target BS, Reference BTS are any at least two base stations of joint transmission A base station.The data transmission method may include：Target BS obtains under UE to the target BS and the UE to Reference BTS Row transmission time delay difference Δ t_DL, which is any one UE of at least two base stations united transmission of joint transmission；The target BS exists Pilot frequency sequence after sending compensation linear phase to the UE on subcarrier kFor carrying out channel measurement；Wherein, r It (k) is the corresponding pilot frequency sequence on sub-carrierk of preset target BS in channel measurement pilot frequency；K is more than or equal to 0 Positive integer；Target BS receives the target BS of UE transmission in subcarrier k wave beam forming vector w (k) again；Target BS exists Compensated data are sent to the UE on subcarrier kS (k) is target BS on sub-carrierk to UE's Traffic sequence to be sent, w ' are the corresponding element of port that target BS sends s (k) in w (k).

Data transmission method provided by the present application determines propagation delay time to each UE of joint transmission from the angle of base station Difference, obtained transmission time delay difference are the data of user class, ensure that the precision of determining transmission time delay difference.And will be determining under Row propagation delay time is applied in joint transmission, for correcting interference of the downlink transfer delay inequality to joint transmission process, to improve The accuracy of joint transmission.

Optionally, the PMI that w (k) or UE are fed back to the target BS.

In conjunction with second aspect, in one possible implementation, target BS obtains UE to the target BS and the UE To the downlink transfer delay inequality Δ t of Reference BTS_DL, specifically can be implemented as：Target BS first uses uplink time delay measuring technique, Uplink delay, τ of the acquisition UE to the target BS_UL, τ_ULFor the data feedback channel delay, τ of target BS_RxWith UE to the target The path delay of time τ of base station_PathSum, the UE be joint transmission at least two base stations united transmission any one UE；Then, mesh It marks base station and obtains τ_ULWith the uplink delay, τ of UE to Reference BTS '_ULUplink delay inequality Δ t_UL；The target BS is again Obtain the difference DELTA t of itself and the uplink and downlink channel time delay difference of Reference BTS_Re, the uplink and downlink channel time delay difference of a base station is the base The down going channel delay, τ stood_TxSubtract data feedback channel delay, τ_Rx；Finally, the Δ t that the target BS will be previously obtained_ULWith Δ t_RePhase Add, obtains downlink transfer delay inequality Δ t of the UE to the target BS and the UE to Reference BTS_DL。

It should be noted that target BS obtains under UE to the target BS and the UE to Reference BTS in second aspect Row transmission time delay difference Δ t_DLSpecific implementation it is identical as first aspect, no longer repeated one by one herein.

The third aspect, the embodiment of the present application provide a kind of device of determining transmission time delay difference, the determination transmission time delay difference Device can be some or all of target BS in above-mentioned first aspect method example, and the device of the determination transmission time delay difference can To realize the function of target BS in above-mentioned first aspect method example.The function can also be passed through by hardware realization Hardware executes corresponding software realization.The hardware or software include one or more above-mentioned corresponding modules of function.

In conjunction with the third aspect, in one possible implementation, wrapped in the structure of the device of the determination transmission time delay difference Processor and transceiver are included, which is configured as that the device of the determination transmission time delay difference is supported to execute in the above method accordingly Function.The transceiver is used to support the communication between the device of the determination transmission time delay difference and other network elements.Determination transmission The device of delay inequality can also include memory, which saves the determination transmission time delay difference for coupling with processor The necessary program instruction of device and data.

Fourth aspect, the embodiment of the present application provide a kind of data transmission device, which can be above-mentioned the Some or all of target BS in two aspect method examples, above-mentioned second party may be implemented in the device of the determination transmission time delay difference The function of target BS in the method example of face.The function can also be executed corresponding soft by hardware realization by hardware Part is realized.The hardware or software include one or more above-mentioned corresponding modules of function.

It include processor in the structure of the data transmission device in one possible implementation in conjunction with fourth aspect And transceiver, the processor are configured as that the data transmission device is supported to execute corresponding function in the above method.The transceiver For supporting the communication between the data transmission device and other network elements.The data transmission device can also include memory, should Memory saves the necessary program instruction of the data transmission device and data for coupling with processor.

5th aspect, the embodiment of the present application provides a kind of computer storage medium, for being stored as above-mentioned first aspect Computer software instructions used in the function of the exemplary target BS of method, it includes for executing designed by above-mentioned first aspect Program.

6th aspect, the embodiment of the present application provides a kind of computer storage medium, for being stored as above-mentioned second aspect Computer software instructions used in the function of the exemplary target BS of method, it includes for executing designed by above-mentioned second aspect Program.

Any scheme that the above-mentioned third aspect is provided into the 6th aspect, provides really for realizing above-mentioned first aspect The data transmission method determining the method for transmission time delay difference or being provided for realizing above-mentioned second aspect, therefore can be with first party Face or second aspect reach identical beneficial effect, are no longer repeated herein.

Detailed description of the invention

Fig. 1 is transmission time delay difference schematic diagram in the prior art；

Fig. 2 is a kind of structural schematic diagram of joint transmission communication system architecture provided by the embodiments of the present application；

Fig. 2 a is a kind of structural schematic diagram of joint transmission communication system architecture provided by the embodiments of the present application；

Fig. 3 is a kind of structural schematic diagram of the device of determining transmission time delay difference provided by the embodiments of the present application；

Fig. 4 is a kind of structural schematic diagram of data transmission device provided by the embodiments of the present application；

Fig. 5 is a kind of flow diagram of the method for determining transmission time delay difference provided by the embodiments of the present application；

Fig. 6 is a kind of definition schematic diagram of delay parameter provided by the embodiments of the present application；

Fig. 7 is a kind of schematic diagram of the measurement process of uplink time delay measuring technique provided by the embodiments of the present application；

Fig. 8 is the definition schematic diagram of delay parameter between a kind of base station provided by the embodiments of the present application；

Fig. 9 is the flow diagram of another method for determining transmission time delay difference provided by the embodiments of the present application；

Figure 10 is a kind of flow diagram of data transmission method provided by the embodiments of the present application；

Figure 11 is the structural schematic diagram of another device for determining transmission time delay difference provided by the embodiments of the present application；

Figure 12 is the structural schematic diagram of the device of another determination transmission time delay difference provided by the embodiments of the present application；

Figure 13 is the structural schematic diagram of the device of another determination transmission time delay difference provided by the embodiments of the present application；

Figure 14 is the structural schematic diagram of another data transmission device provided by the embodiments of the present application；

Figure 15 is the structural schematic diagram of another data transmission device provided by the embodiments of the present application.

Specific embodiment

Currently, channel measurement plays very important effect in a communications system, and under the scene of joint transmission, it is more A base stations united wave beam forming carries out data transmission with UE, since there are transmission time delay differences between different base station, leads to channel measurement Inaccuracy, and then data transmission is caused to have error, reduce the reliability of communication system.

Below under joint transmitting scene, the downlink transfer delay inequality between base station is briefly described, in the course of the description By taking two base stations as an example.

As shown in present context technical description and Fig. 1, two base stations are to transmission time delay difference existing between UE mainly by two Divide and constitutes：1, the channel time delay difference τ in base station down channel_Tx1-τ_Tx2；2, path delay of time difference τ caused by transmission path is different_Path1- τ_Path2.The two are partly superimposed together, and the signal of the received different base station of UE is caused to have different delay situations in the time domain.

Illustratively, below with orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) for system, derive influence of the demonstration transmission time delay difference to transmission signal.Process in other systems It is similar, no longer repeated one by one.

In an ofdm system, there are following transformational relations for time-domain signal and frequency-region signal.Wherein, x (t) indicates time domain letter Number, X (k) indicates frequency-region signal.Specifically, be that formula (1) is shown by the transformational relation that frequency-region signal is converted to time-domain signal, it will The transformational relation that time-domain signal is converted to frequency-region signal is shown in formula (2)

Transformational relation based on above-mentioned time-domain signal and frequency-region signal, when there are transmission time delay difference τ, time-domain signal can be with It is represented as x (t- τ), corresponding frequency-region signal is：

By above-mentioned derivation process it is found that transmission time delay difference τ is finally embodied in each equipment for sending signal in subcarrier k estimation Obtained channel coefficients H (k) attached different phase rotatioiesIn channel measurement, it is limited to the reporting ability of UE, Channel measurement is also needed to be reported to apparatus for transmitting signal again after quantifying, because of channel coefficients caused by transmission time delay difference Linear phase superposition, it is final to influence during the channel quantitative of UE.

Channel measurement and quantizing process are illustrated below, using main serving cell channel as benchmark channel, 1Port+1Port Relevant JT for, there are propagation delay time difference τ₂-τ₁When measurement result of the UE to down channel on sub-carrierk, be expressed as letter Road coefficient matrix is：

Wherein, h₁(k) channel coefficients of main serving cell, h are indicated₂(k) channel coefficients of cooperation cell are indicatedIndicate the channel coefficients after cooperation cell is influenced by transmission time delay difference.

Correspondingly, there are propagation delay time difference τ₂-τ₁When, the related of each subcarrier influenced by transmission time delay difference is put to the proof Then it is expressed as follows：

Wherein, the conjugation of * representing matrix, the transposition of H representing matrix.

When transmission time delay difference may be not present, the correlation matrix calculation formula of each subcarrier is as follows：

When feeding back the PMI of order Rank=1, entire quantizing process includes quantized subband or full band quantization, for its meter It is as follows to calculate formula.

The calculation formula of subband PMI quantization：

Wherein,Indicate the starting carrier wave of subband,Indicate that the end carrier wave of subband, w indicate available in code book Different PMI serial numbers corresponding Rank=1 when weight vector, H indicates the transposition of vector, W₁Indicate existing PMI code book Rank The set of all optional vectors when=1.

The full calculation formula with PMI quantization：Wherein,Indicate downlink The termination carrier wave of full band.

As above-mentioned PMI quantizing process it is found that since each carrier wave is because linear phase caused by transmission time delay difference is in correlation matrix It is still remained when cumulative, this will aggravate the dispersion degree of correlation matrix, so that when channel with a PMI to quantify one section of carrier wave Quantified precision decline.Therefore, it is linear caused by downlink transfer delay inequality to correct in transmission process to obtain downlink transfer delay inequality Phase Stacking could improve the precision of measurement to guarantee the reliability of system.

Based on this, the basic principle of the application is：Using existing uplink time delay measuring technique, obtain between base station and UE Obtained after row propagation delay time UE to different base station uplink delay inequality, then obtain different base station it is respective up and down row of channels when The relationship for prolonging difference, obtains downlink transfer delay inequality.For whole process using user as granularity, obtained downlink transfer delay inequality is also to use Family grade, accordingly, it is determined that downlink transfer delay inequality it is more accurate.

The method of determining transmission time delay difference provided by the embodiments of the present application is applied to combine biography as shown in Fig. 2 or Fig. 2 a In the framework of defeated communication system.

As shown in Fig. 2, base station 201 in joint transmission communication system including at least two joint transmissions and at least two The UE 202 of base station progress joint transmission.At least two base stations 201 are communicated using united wave beam forming with UE202, with Realize joint transmission.

As shown in Figure 2 a, the framework of another joint transmission communication system, the joint transmission communication of Fig. 2 a signal are illustrated System is similar to the joint transmission communication system that Fig. 2 is provided, and function and principle no longer repeat one by one.As shown in Figure 2 a, Fig. 2 a The framework of the joint transmission communication system of signal includes that joint transmission is logical in the framework for the joint transmission communication system that Fig. 2 is provided Base station 201 in letter system including at least two joint transmissions and the base with the UE 202 of at least two base stations progress joint transmission On plinth, the central node 203 that at least two base stations 201 of deployment and joint transmission are separately connected, for at least two base stations 201 carry out centralized management, and at least two base stations 201 are communicated using united wave beam forming with UE202, to realize joint Transmission.

Wherein, central node 203 can be server or other kinds of equipment, and the embodiment of the present application is for centromere The type of point 203 is without specifically limiting.Centralized management of the central node 203 at least two base stations 201 of joint transmission It can include but is not limited at least one in following management：Management and running, centralized parameter calculating etc..

It should be noted that the connection type of at least two base stations 201 of central node 203 and joint transmission, Ke Yiwei Wired connection, or be wirelessly connected, the embodiment of the present application to this also without specifically limiting, can portion according to actual needs Administration.For the connection type of central node 203 and at least two base stations 201 of joint transmission in Fig. 2 a, only one kind is shown Example, does not constitute any restriction.

Optionally, the communication system of Fig. 2 or Fig. 2 a signal can be LTE system or Universal Mobile Communication System (Universal Mobile Telecommunications System, UMTS) etc., the embodiment of the present application is for communication system Type without specifically limiting.Base station described herein refers to the network that access service is provided a user in communication system Equipment has different addresses, referred to herein, generally, as base station in different communication systems.UE described herein is with communication The mobile communication equipment used by a user of system, there is different addresses, referred to herein, generally, as UE in different communication systems.

It should be noted that UE described in this application, can be mobile phone, tablet computer, laptop, super movement Personal computer (Ultra-mobile Personal Computer, UMPC), net book, personal digital assistant (Personal Digital Assistant, PDA), e-book, mobile TV, wearable device, PC (Personal Computer, PC) etc..The embodiment of the present application for UE type also without specifically limiting.

It should also be noted that, simply by exemplary form in Fig. 2 or Fig. 2 a, two base stations 201 and therewith are embodied One UE 202 of joint transmission, but be not the quantity to the base station 201 and UE 202 that include in joint transmission communication system Restriction.In practical applications, the base station 201 for including in joint transmission communication system and UE 202 can be configured according to demand Quantity, and the quantity with the base station 202 of 202 joint transmission of UE.

With reference to the accompanying drawing, the embodiment of the present invention is specifically addressed.

On the one hand, the embodiment of the present application provides a kind of device of determining transmission time delay difference, and Fig. 3 shows each with the application A kind of relevant structural schematic diagram of the device 30 of determining transmission time delay difference of embodiment.Determine that the device 30 of transmission time delay difference can be with It is deployed in the base station 202 in joint transmission communication system shown in Fig. 2 or Fig. 2 a.Accordingly, it is determined that the device of transmission time delay difference 30 can be some or all of base station 202.Base station 202 can for joint transmission at least two base stations in except Reference BTS it Any one outer base station, Reference BTS are any of at least two base stations of joint transmission base station.

As shown in figure 3, determining that the device 30 of transmission time delay difference may include：Processor 301, memory 302, communication bus 303 and transceiver 304.

Wherein, memory 302 are transferred to processor 301 for storing program code, and by the program code, to locate It manages device 301 and executes the various functions that program code realizes the device 30 of determining transmission time delay difference.Memory 302 can be volatibility Memory (volatile memory), such as random access memory (random-access memory, RAM)；Or it is non-easy The property lost memory (non-volatile memory), such as read-only memory (read-only memory, ROM), flash Device (flash memory), hard disk (hard disk drive, HDD) or solid state hard disk (solid-state drive, SSD)； Or the combination of the memory of mentioned kind.

Processor 301 is the control centre of the device 30 of determining transmission time delay difference, can be a central processing unit (central processing unit, CPU), is also possible to specific integrated circuit (application specific Integrated circuit, ASIC), or be arranged to implement one or more integrated circuits of the embodiment of the present application, Such as：One or more microprocessors (digital singnal processor, DSP), or, one or more scene can It programs gate array (field programmable gate array, FPGA).Processor 301 can be deposited by running or executing The program code in memory 302 is stored up, and calls the data being stored in memory 302, realizes and determines transmission time delay difference Device 30 various functions.

Communication bus 303 can be industry standard architecture (industry standard architecture, ISA) Bus, external equipment interconnection (peripheral component Interconnect, PCI) bus or extension industrial standard body Architecture (extended industry standard architecture, EISA) bus etc..The bus 303 can be divided into Address bus, data/address bus, control bus etc..Only to be indicated with a thick line in Fig. 3 convenient for indicating, it is not intended that only A piece bus or a type of bus.

Transceiver 304 can for determine transmission time delay difference device 30 communication port or antenna, be used for and other nets Network equipment communication interaction.

Wherein, processor 301 is specifically used for：UE is obtained to determination by transceiver 304 using uplink time delay measuring technique The uplink delay, τ of base station where the device 30 of transmission time delay difference_UL, τ_ULFor the data feedback channel delay, τ of the base station_RxWith UE To the path delay of time τ of the base station_PathSum, the UE be joint transmission at least two base stations united transmission any one UE；So Afterwards, τ is obtained_ULWith the uplink delay, τ of UE to Reference BTS '_ULUplink delay inequality Δ t_UL；Itself and benchmark are obtained again The difference DELTA t of the uplink and downlink channel time delay difference of base station_Re, the uplink and downlink channel time delay difference of a base station is the down going channel of the base station Delay, τ_TxSubtract data feedback channel delay, τ_Rx；Finally, the Δ t that will be previously obtained_ULWith Δ t_ReIt is added, obtains UE to the base station and is somebody's turn to do Downlink transfer delay inequality Δ t of the UE to Reference BTS_DL。

On the other hand, the embodiment of the present application provides a kind of data transmission device, and Fig. 4 is shown and each embodiment of the application A kind of structural schematic diagram of relevant data transmission device 40.Data transmission device 40 can be deployed in shown in Fig. 2 or Fig. 2 a In base station 202 in joint transmission communication system.Therefore, data transmission device 40 can be some or all of base station 202.

As shown in figure 4, data transmission device 40 may include：Processor 401, memory 402, communication bus 403 and receipts Send out device 404.

Wherein, memory 402 are transferred to processor 401 for storing program code, and by the program code, to locate It manages device 401 and executes the various functions that program code realizes data transmission device 40.Memory 402 can be volatile Memory, such as RAM；Or non-volatile memory, such as ROM, flash memory, HDD or SSD；Or it is above-mentioned The combination of the memory of type.

Processor 401 is the control centre of data transmission device 40, can be a CPU, is also possible to ASIC, either It is configured to implement one or more integrated circuits of the embodiment of the present application, such as：One or more DSP, or, one or more A FPGA.Processor 401 can be by running or execute the program code being stored in memory 402, and calls and be stored in Data in memory 402 realize the various functions of data transmission device 40.

Communication bus 403 can be isa bus, pci bus or eisa bus etc..It is total that the bus 403 can be divided into address Line, data/address bus, control bus etc..Only to be indicated with a thick line in Fig. 4 convenient for indicating, it is not intended that only one total Line or a type of bus.

Transceiver 404 can be the communication port or antenna of data transmission device 40, for logical with other network equipments Letter interaction.

Wherein, processor 401 is specifically used for：The base station where UE to data transmission device 40 is obtained by transceiver 404 With the downlink transfer delay inequality Δ t of the UE to Reference BTS_DL, which is appointing at least two base stations united transmission of joint transmission One UE, Reference BTS are any at least two base stations of joint transmission in addition to the base station where data transmission device 40 A base station；Pilot frequency sequence after sending compensation linear phase to the UE on sub-carrierkFor carrying out channel Measurement；Wherein, r (k) is the preset base station corresponding pilot frequency sequence on sub-carrierk in channel measurement pilot frequency；K be greater than or Positive integer equal to 0；The base station of UE transmission is received again in subcarrier k wave beam forming vector w (k)；On sub-carrierk to this UE sends compensated dataS (k) is base station on sub-carrierk to the traffic sequence to be sent of UE, and w ' is Base station in w (k) where data transmission device 40 sends the corresponding element of port of s (k).

In another aspect, the embodiment of the present application provides a kind of method of determining transmission time delay difference, applied to joining in communication system The target BS of transmission is closed, which is any one base at least two base stations of joint transmission in addition to Reference BTS It stands, the device of determining transmission time delay difference is deployed in the base station, Reference BTS is any at least two base stations of joint transmission A base station.Each base station at least two base stations of joint transmission in addition to Reference BTS executes the application respectively and implements Example provides the method for fixed response time difference really, can be referred to as target BS, the embodiment of the present application only with a target BS (i.e. Any one base station at least two base stations of joint transmission in addition to Reference BTS) the course of work for, describe the application Embodiment provides the method for fixed response time difference really, other are no longer repeated one by one." target described in the embodiment of the present application Base station " is the base station for executing method provided by the embodiments of the present application.

It should be noted that the method for determining transmission time delay difference provided by the embodiments of the present application can be applied to joint transmission Any scene and any standard under.Illustratively, the method for determining transmission time delay difference provided by the embodiments of the present application can answer For being lightly loaded scene, i.e. when the load of the cell of the base station offer of joint transmission is not very serious, using the UE of relevant JT transmission It is in the edge of multiple cells again.Illustratively, the method for determining transmission time delay difference provided by the embodiments of the present application can be applied In frequency division duplex (Frequency Division Dual, FDD) system.

The embodiment of the present application provides a kind of method of determining transmission time delay difference by being disposed when determining transmission in target BS The device for prolonging difference executes, for convenience, function, that is, corresponding intrument function of the target BS of described in the text, and no longer one by one Difference.As shown in figure 5, the method for the determination transmission time delay difference may include：

S501, target BS use uplink time delay measuring technique, the uplink delay, τ of acquisition UE to target BS_UL。

Wherein, τ_ULFor the data feedback channel delay, τ of target BS_RxWith the path delay of time τ of UE to target BS_PathSum. τ obtained in S501_ULFor user-level data, need real-time periodic measurement, the embodiment of the present application for the measurement period not into Row is specific to be limited, and can be determined according to actual needs.

Wherein, the definition of delay parameter involved in the embodiment of the present application is as shown in Figure 6.τ_RxIndicate that the uplink of target BS is logical Road time delay, τ_TxIndicate the down going channel time delay of target BS, τ_PathIndicate the path delay of time to UE of target BS (in Fig. 6 It is illustrated as τ_P), τ '_RxIndicate the data feedback channel time delay of Reference BTS, τ '_TxIndicate the down going channel time delay of Reference BTS, τ '_PathTable Show that the path delay of time to UE of target BS (is illustrated as τ ' in Fig. 6_P)。

It needs in explanation, UE described in the embodiment of the present application is any one UE of at least two base stations united transmission, right In each UE, the method for the embodiment of the present application can be used to obtain using each UE as the propagation delay time of the UE rank of granularity Difference, therefore, the embodiment of the present application are described for obtaining for the transmission time delay difference of a UE, other are no longer gone to live in the household of one's in-laws on getting married one by one It states.

Illustratively, uplink time delay measuring technique refers to and utilizes uplink demodulation reference signal (Demodulation Reference Signal, DMRS) or channel-sounding signal (Sounding Reference Signal, SRS) measure UE to base The propagation delay time stood.Specifically, may include using the detailed process of the uplink time delay measuring technique of uplink DMRS or SRS：UE Uplink be configured fixed resource position and send DMRS or SRS, base station side passes through least square in the fixed resource position of configuration The measurements such as (Least Square, LS) estimation obtain the channel coefficients of multiple subcarriers；Base station side arranges continuous channel coefficients Column, and zero padding is to 2 multiple power, then by inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT time domain data) is converted to；Then in the time domain according to the peak value of power delay spectrum (Power Delay Profile, PDP) Find most powerful path position；Finally it is arranged according to threshold value (lower than the numerical value of main diameter), searches for first path position, obtains time delay estimation, i.e., Obtained UE to base station uplink delay, τ_UL.Fig. 7 illustrates the measurement process of above-mentioned uplink time delay measuring technique, including mistake The parameter mentioned in journey.

It should be noted that above-mentioned example, which is only through way of example, describes a kind of uplink time delay measuring technique acquisition UE to base station uplink time delay process, be not the specific restriction to uplink time delay measuring technique process.It is all to lead to The method that UE obtains uplink time delay into the uplink of base station in letter system can be applied to execute S501, referred to as For the uplink time delay measuring technique in S501, the embodiment of the present application for uplink time delay measuring technique detailed process without limit It is fixed.

S502, target BS obtain τ_ULWith the uplink delay, τ of UE to Reference BTS '_ULUplink delay inequality Δ t_UL。

Specifically, by S501 it is found that τ_UL=τ_Rx+τ_Path, therefore, τ '_UL=τ '_Rx+τ′_Path.Wherein, τ '_RxFor benchmark base station Data feedback channel time delay, τ '_PathFor the path delay of time of UE to Reference BTS.

Due to Δ t_UL=τ_UL-τ′_UL, by the τ_UL=τ_Rx+τ_PathAnd τ '_UL=τ '_Rx+τ′_PathSubstitute into Δ t_ULCalculating formula push away It leads as follows：Δt_UL=τ_UL-τ′_UL=(τ_Rx+τ_Path)-(τ′_Rx+τ′_Path)=(τ_Rx-τ′_Rx)+(τ_Path-τ′_Path).On eating dishes without rice or wine Delay variation be large scale information, it is believed that the path delay of time reciprocity between UE and base station when downstream transmission is equal, thus may be used Know, when getting Δ t in S502_ULWhen, imply and has obtained path delay of time difference part τ needed for downlink transfer delay inequality_Path- τ′_Path, then the data feedback channel delay inequality between target BS and Reference BTS balanced out by subsequent step, downlink biography can be obtained Defeated delay inequality.

In a kind of implementation, in S502, target BS can get Δ t with Reference BTS by interacting_UL.It can Choosing, it sends and requests from target BS to Reference BTS, obtain the τ ' of Reference BTS_UL, then target BS calculates Δ t_UL.It can Choosing, the τ of itself is sent from target BS to Reference BTS_UL, Δ t is calculated by Reference BTS_ULAfter feed back to target BS.When So, the embodiment of the present application is for obtaining Δ t in S502_ULDetailed process without limit, reality can be configured according to actual needs It is existing, it is all to obtain τ_ULWith the uplink delay, τ of UE to Reference BTS '_ULUplink delay inequality Δ t_UL, belong to this Shen Aspects please.

In another implementation, in S502, target BS can get Δ t with central node by interacting_UL。 In this implementation, each base station of joint transmission is delayed when getting respective uplink, feeds back to centromere The Δ t between target BS and Reference BTS is calculated by central node centralization for point_ULAfterwards, target BS is fed back to.

S503, target BS obtain the difference DELTA t of itself and the uplink and downlink channel time delay difference of Reference BTS_Re。

Wherein, the uplink and downlink channel time delay difference of a base station is the down going channel delay, τ of the base station_TxSubtract τ_Rx；Benchmark base The uplink and downlink channel time delay difference stood be benchmark base station down going channel delay, τ '_TxSubtract τ '_Rx。

Specifically, Δ t_Re=(τ_Tx-τ_Rx)-(τ′_Tx-τ′_Rx), derivation can obtain, Δ t_Re=(τ_Tx-τ′_Tx)-(τ_Rx-τ′_Rx), by This is derived it is found that when obtaining Δ t in S503_ReWhen it is logical to get down going channel delay inequality and uplink between base station and Reference BTS has been arrived The relationship of road delay inequality so can be with Δ t obtained in S502_ULIt further calculates to obtain downlink transfer in S504 Delay inequality Δ t_DL。

Optionally, Δ t is obtained in S503_ReMode can be by any realization in following two ways, both Mode can specifically include：

The uplink and downlink channel time delay that mode 1, each base station respectively directly read itself is poor, then calculates Δ t_Re。

Since the uplink and downlink delay inequality in each channel in each base station mainly (is such as put by devices various on middle radio-frequency channel introducing Big device, filter, duplexer etc.), middle radio frequency would generally measure to obtain the delay inequality of upper and lower row of channels and the production as middle radio frequency Product parameter saves, referred to as middle radio-frequency information, then, in mode 1, each base station can directly read the middle radio frequency letter of itself Breath obtains the uplink and downlink channel time delay difference τ of base station_Tx-τ_Rx, the middle radio-frequency information that Reference BTS can also directly read itself obtains it The uplink and downlink channel time delay difference τ ' of itself_Tx-τ′_Rx。

Optionally, the uplink and downlink of its own is obtained in the middle radio-frequency information that each base station of joint transmission directly reads itself After channel time delay difference, Δ t can be calculated by interaction between target BS and Reference BTS_Re=(τ_Tx-τ_Rx)-(τ′_Tx-τ ′_Rx)。

It should be noted that the interaction in aforesaid way 1 between target BS and Reference BTS, with target BS in S502 with Interaction between Reference BTS is similar, and only interaction content is different, is no longer described in detail herein.

Optionally, the uplink and downlink of its own is obtained in the middle radio-frequency information that each base station of joint transmission directly reads itself After channel time delay difference, the uplink and downlink channel time delay difference of itself is fed back to central node by each base station, is calculated by central node Δt_Re=(τ_Tx-τ_Rx)-(τ′_Tx-τ′_Rx) after, by the Δ t of calculating_ReFeed back to target BS.

Reciprocity measuring signal is mutually sent out between 2, two base stations of mode obtains Δ t_Re。

Specifically, a reciprocity measuring signal is sent mutually between two base stations, by measuring knot twice in mode 2 Required Δ t can be obtained in the difference of fruit_Re.The difference of the specific uplink and downlink channel time delay difference for obtaining target BS and Reference BTS Δt_Re, may include following step 1 to step 3：

Step 1, target BS send the first reciprocity measuring signal to Reference BTS, obtain target for Reference BTS measurement Delay, τ of the base station to Reference BTS_1to2, wherein implicit time delay content is as follows：τ_1to2=τ_Tx+τ_Air+τ′_{Rx measurement}.Wherein, τ '_{Rx measurement} Time delay is measured for the data feedback channel of benchmark base station.

Step 2, target BS receive the second reciprocity measuring signal that Reference BTS is sent, and measurement obtains Reference BTS to mesh Mark the delay, τ of base station_2to1, wherein implicit time delay content is as follows：τ_2to1=τ '_Tx+τ_Air+τ_{Rx measurement}.Wherein, τ_{Rx measurement}For target base The data feedback channel measurement time delay stood.

The difference of the uplink and downlink channel time delay difference of two base station measurements then can be obtained in measurement content based on step 1 and step 2 It is worth Δ t '_Re, particular content is as follows：

Δt′_Re=τ_1to2-τ_2to1

=(τ_Tx+τ_Air+τ′_{Rx measurement})-(τ_T′_x+τ_Air+τ_{Rx measurement})

=(τ_Tx-τ_{Rx measurement})-(τ_T′_x-τ′_{Rx measurement})

It should be noted that the content and type of reciprocity measuring signal, can configure according to actual needs, the application is real Example is applied to this without specifically limiting.

Wherein, when mutually sending out reciprocity measuring signal between two base stations, each delay parameter is as shown in Figure 8 between base station.

Optionally, during the realization of above-mentioned steps 1 and step 2, since measure experience twice is same channel, when See the power profile shape of time domain sequences is similar on domain, it is therefore possible to use relevant peaks detection scheme directly acquires Δ t '_Re, τ is used for substituting_1to2、τ_2to1Obtain Δ t '_ReProcess.

Step 3, the difference DELTA t ' by the uplink and downlink channel time delay differences of two base station measurements_ReIt is actual to obtain two base stations The difference DELTA t of uplink and downlink channel time delay difference_Re。

Specifically, from step 2 the uplink and downlink channel time delay difference of two base station measurements difference DELTA t '_ReParticular content can Know, Δ t '_ReWith Δ t_ReDifference be exactly each base station out-hole run channel time delay Yu uplink physical channel time delay relationship.And For different communication systems, base station out-hole run channel time delay has different relationships from uplink physical channel time delay, specific to wrap Include following two kinds of relationships：

In the first relationship, uplink and downlink difference display system, base station out-hole run channel time delay and uplink physical channel time delay It differs, but there is fixed relationship.

In the first relationship, due to the system of uplink and downlink different frequencies, uplink and downlink is in different frequencies, and in reciprocity Sent and received in measurement process frequency be it is identical, by taking downstream frequency is constant as an example, this means that in correction course and receives The frequency point in channel and actual uplink reception frequency point be not identical, therefore leads to τ_Rxi≠τ_{Rxi measurement}, but there is determination in engineering in the two Relationship, device welding after the completion of, the data can measure obtains, that is, have τ_Rxi=τ_{Rxi measurement}+Δτ_Rxi。Δτ_RxiCan be by middle radio frequency It can be provided by middle radio frequency as product parameters as what product parameters provided.Wherein, τ_RxiRefer to the practical biography of uplink of a base station Defeated time delay.

Therefore, in the first above-mentioned relationship, when executing above-mentioned steps 3, therefrom radio-frequency information reads target to target BS The difference DELTA τ of base station actual uplink channel time delay and Measurement channel time delay_Rx, the benchmark base of target BS reception Reference BTS transmission The difference DELTA τ ' of the actual uplink channel time delay and Measurement channel time delay stood_Rx, then can calculate Δ t_ReIt is as follows：

Δt_Re=Δ t '_Re-(Δτ_Rx-Δτ′_Rx)

=τ_1to2-τ_2to1-(Δτ_Rx-Δτ′_Rx)

=(τ_Tx-τ_{Rx measurement})-(τ′_Tx-τ′_{Rx measurement})-(τ_Rx-τ_{Rx measurement})+(τ′_Rx-τ′_{Rx measurement})

=τ_Tx-τ_{Rx measurement}-τ′_Tx+τ′_{Rx measurement}-τ_Rx+τ_{Rx measurement}+τ′_Rx-τ′_{Rx measurement}

=(τ_Tx-τ_Rx)-(τ′_Tx-τ′_Rx)

Second of relationship, uplink and downlink are in display system, base station out-hole run channel time delay and uplink physical channel time delay phase Deng.

In second of relationship, since base station out-hole run channel time delay is equal with uplink physical channel time delay, in execution When stating step 3, the Δ τ ' that obtains in step 2_RxAs Δ t_Re。

S504, target BS are by Δ t_ULWith Δ t_ReIt is added, obtains UE and passed to target BS and UE to the downlink of Reference BTS Defeated delay inequality Δ t_DL。

Specifically, by Δ t obtained in S502_ULAnd Δ t obtained in S503_ReIt is added, calculates as follows：

Δt_DL=Δ t_UL+Δt_Re=(τ_Rx-τ′_Rx)+(τ_Path-τ′_Path)+(τ_Tx-τ′_Tx)-(τ_Rx-τ′_Rx)

=(τ_Tx-τ′_Tx)+(τ_Path-τ′_Path)

=Δ t_DL

Further, after the method for the determination transmission time delay difference that application provides determines downlink transfer delay inequality, may be used also During joint transmission, to be corrected to downlink transfer delay inequality using determining downlink transfer delay inequality.Therefore, as schemed Shown in 9, after S504, the embodiment of the present application further includes the data transmission procedure of S505 to S507.

S505, target BS send the pilot frequency sequence after compensating linear phase to UE on sub-carrierk For carrying out channel measurement.

Wherein, r (k) is preset target BS corresponding pilot frequency sequence on sub-carrierk in channel measurement pilot frequency；K is Positive integer more than or equal to 0.The content of preset pilot frequency sequence is that base station knows that the embodiment of the present application is for preset with UE altogether Navigation content is without specifically limiting.

Specifically, S505 is only described by object of target BS, it is then multiple port corresponding from the point of view of system perspective Pilot frequency sequence matrix in, the corresponding element of target BS compensates linear phaseThe pilot frequency sequence of Reference BTS not into Row correction.

By compensating linear phase to preset pilot frequency sequenceCorrect downlink transfer during channel measurement Deviation caused by delay inequality, so that channel measurement is more acurrate.

S506, target BS receive wave beam forming vector w (k) of the target BS in subcarrier k of UE transmission.

Specifically, the target BS that UE is sent can carry out channel survey in the wave beam forming vector w (k) of subcarrier k for UE Amount, the PMI matrix of acquisition.

S507, target BS send compensated data to UE on sub-carrierk

Wherein, s (k) is target BS on sub-carrierk to the traffic sequence to be sent of UE, and w ' is target BS in w (k) Send the corresponding element of port of s (k).

Specifically, S507 is only described by object of target BS, it is then multiple port corresponding from the point of view of system perspective Traffic sequence matrix to be sent in, the corresponding element of target BS compensates linear phaseThe corresponding member of Reference BTS Element is without compensation.

By compensating linear phase to traffic sequence to be sentCorrect downlink transfer in data transmission procedure Deviation caused by delay inequality, so that data transmission is more acurrate.

When distinguishing two channels progress joint transmissions below with two base stations, the transmission process of data carries out example description, I.e. by taking the relevant JT of 2+2 as an example, it is assumed that the downlink transfer delay inequality of cooperative base station to UE have determined as Δ t in two base stations_DL, It is as follows using the data transmission procedure after downlink transfer delay inequality correction：

Assuming that four Port are [r in corresponding pilot frequency sequence matrix₀(k)r₁(k)r₂(k)r₃(k)], Reference BTS is in pilot tone Corresponding pilot frequency sequence is r in sequence matrix₀(k) and r₁(k), for corresponding to two channels of Reference BTS, target BS is being led Corresponding pilot frequency sequence is r in frequency sequence matrix₂(k) and r₃(k), for corresponding to two channels of target BS.In order to compensate for biography Interference of the defeated delay inequality to channel measurement compensates a linear phase, the pilot tone under compensating on the pilot frequency sequence of target BS Sequence sending metrix becomes：

After channel measurement phase compensation, still by taking the FDD of 2+2 is concerned with JT as an example, it is assumed that target BS is on sub-carrierk It is s (k) to the traffic sequence to be sent of user, the influence for compensation transmission time delay difference to data transmission procedure is sent pending When the traffic sequence sent, a linear phase, so, the base of UE and joint transmission are compensated on two channels of target BS The service signal that mode between standing, i.e. UE receive can be expressed as：

Y (k)=H (k) T (k) w (k) s (k)+n

Wherein, s (k) is traffic sequence to be sent, and H (k) is the real channel undergone when traffic sequence is transmitted, and w (k) is The wave beam forming vector on the subcarrier that the UE channel measurement obtains (is chosen as：The PMI that channel measurement reports), T (k) is Downlink transfer delay compensation matrix is transmitted, particular content is as follows：

By above-mentioned transmission process it is found that first correcting channel measurement process, when carrying out joint transmission data to UE, when using Prolong the PMI that channel measurement arrives after correcting, and will be when sending multiplied by the compensation matrix of downlink transfer time delay, to realize user The transmission time delay difference correction of grade.The line number of the compensation matrix of downlink transfer time delay is equal to the line number of down channel coefficient, columns etc. In the columns of down beam shaping vector, the leading diagonal position of the compensation matrix of downlink transfer time delay is then delay compensation value, The delay compensation value of Reference BTS is 1, and the delay compensation value of target BS isΔt_DLIt is passed for the downlink of target BS Defeated delay inequality, target BS are any one base station at least two base stations of joint transmission in addition to Reference BTS.

In another aspect, the embodiment of the present application provides a kind of data transmission method, be applied to target BS, the target BS with The executing subject of the method for the determination transmission time delay difference of Fig. 9 signal is identical.As shown in Figure 10, this method may include：

S1001, target BS obtain UE to the downlink transfer delay inequality Δ t of target BS and UE to Reference BTS_DL。

Wherein, the UE is identical as the UE in the method for the determination transmission time delay difference that Fig. 9 illustrates, and is no longer repeated herein.

Optionally, in S1001, target BS can be true using the method for Fig. 5 or Fig. 9 determination transmission time delay difference illustrated Fix row transmission time delay difference.Certainly, target BS can also obtain downlink transfer delay inequality by other means, and the application is implemented Example is for obtaining the concrete scheme of downlink transfer delay inequality without limiting in S1001.

S1002, target BS send the pilot frequency sequence after compensating linear phase to UE on sub-carrierk For carrying out channel measurement.

It should be noted that the process of S1002 is identical as the process of S505, this time no longer repeated one by one.

S1003, target BS receive wave beam forming vector w (k) of the target BS in subcarrier k of UE transmission.

It should be noted that the process of S1003 is identical as the process of S506, this time no longer repeated one by one.

S1004, target BS send compensated data to UE on sub-carrierk

It should be noted that the process of S1004 is identical as the process of S507, this time no longer repeated one by one.Figure 10 shows The data transmission method of meaning is identical as the process that S505 in Fig. 9 to S507 illustrates, and is no longer repeated one by one herein.

Angle, the deployment data of the course of work of the target BS of the above-mentioned device that transmission time delay difference is mainly determined from deployment The course of work angle of the target BS of transmitting device is described scheme provided by the embodiments of the present application.It is understood that Be the device for determining transmission time delay difference, data transmission device in order to realize the above functions, it comprises executing, each function is corresponding Hardware configuration and/or software module.Those skilled in the art should be readily appreciated that, in conjunction with implementation disclosed herein Each exemplary unit and algorithm steps of example description, the application can be come with the combining form of hardware or hardware and computer software It realizes.Some function is executed in a manner of hardware or computer software driving hardware actually, spy depending on technical solution Fixed application and design constraint.Professional technician can retouch each specific application using distinct methods to realize The function of stating, but this realization is it is not considered that exceed scope of the present application.

The embodiment of the present application can according to above method example to determine the device of transmission time delay difference, data transmission device into The division of row functional module, for example, each functional module of each function division can be corresponded to, it can also be by two or more Function be integrated in a processing module.Above-mentioned integrated module both can take the form of hardware realization, can also use The form of software function module is realized.It should be noted that being schematically, only to the division of module in the embodiment of the present application For a kind of logical function partition, there may be another division manner in actual implementation.

In the case where each function division of use correspondence each functional module, Figure 11 shows involved in above-described embodiment And determination transmission time delay difference device a kind of possible structural schematic diagram.Determine that the device 110 of transmission time delay difference can wrap It includes：Measuring unit 1101, acquiring unit 1102, computing unit 1103.Measuring unit 1101 determines transmission time delay difference for supporting Device 110 execute Fig. 5 or Fig. 9 in process S501；Acquiring unit 1102 is used for the device 110 for supporting to determine transmission time delay difference Execute process S502, S503 in Fig. 5 or Fig. 9；The device 110 that computing unit 1103 is used to support to determine transmission time delay difference executes Process S504 in Fig. 5 or Fig. 9.Wherein, all related contents for each step that above method embodiment is related to can be quoted Function to corresponding function module describes, and details are not described herein.

Further, as shown in figure 12, determine that the device 110 of transmission time delay difference can also include transmission unit 1104, connect Receive unit 1105.Wherein, the device 110 that transmission unit 1104 is used to support to determine transmission time delay difference executes the process in Fig. 9 S505,S507；The device 110 that receiving unit 1105 is used to support to determine transmission time delay difference executes the process S506 in Fig. 9.

Using integrated unit, Figure 13, which is shown, determines transmission time delay difference involved in above-described embodiment Device a kind of possible structural schematic diagram.The device 130 for determining transmission time delay difference may include：Processing module 1301 is led to Believe module 1302.Processing module 1301 is used to carry out control management to the movement for the device 130 for determining transmission time delay difference.For example, The device 130 that processing module 1301 is used to support to determine transmission time delay difference executes the process S501 to S504 in Fig. 5 or Fig. 9.It is logical The communication of device 130 and other network entities that letter module 1302 is also used to support to determine transmission time delay difference, determines for supporting The device 130 of transmission time delay difference executes the process S505 to S507 in Fig. 9.Determine that the device 130 of transmission time delay difference can also wrap Memory module 1303 is included, the program code and data of the device 130 for storing determining transmission time delay difference.

Wherein, processing module 1301 can be in the entity structure of device 30 of determining transmission time delay difference shown in Fig. 3 Processor 301 can be processor or controller.Such as can be CPU, general processor, DSP, ASIC, FPGA or other Programmable logic device, transistor logic, hardware component or any combination thereof.It, which may be implemented or executes, combines this Shen It please various illustrative logic blocks, module and circuit described in disclosure.Processor 1301, which is also possible to realize, to be calculated The combination of function, such as combined comprising one or more microprocessors, DSP and the combination of microprocessor etc..Communication module 1302 can be the transceiver 304 in the entity structure of the device 30 of determining transmission time delay difference shown in Fig. 3, communication module 1302 Can be communication port, or can be transceiver, transmission circuit or communication interface etc..Memory module 1303 can be Fig. 3 institute Memory 302 in the entity structure of the device 30 of the determination transmission time delay difference shown.

When processing module 1301 is processor, communication module 1302 is transceiver, when memory module 1303 is memory, this The device 130 for applying for determining transmission time delay difference involved in embodiment Figure 13 can be determining transmission time delay difference shown in Fig. 3 Device 30.

In the case where each function division of use correspondence each functional module, Figure 14 shows involved in above-described embodiment And data transmission device a kind of possible structural schematic diagram.Data transmission device 140 may include：Acquiring unit 1401, Transmission unit 1402, receiving unit 1403.The process that acquiring unit 1401 is used to that data transmission device 140 to be supported to execute in Figure 10 S1001；Process S1002, S1004 that transmission unit 1402 is used to that data transmission device 140 to be supported to execute in Figure 10；Receiving unit 1403 for supporting data transmission device 140 to execute the process S1003 in Figure 10.Wherein, what above method embodiment was related to is each All related contents of step can quote the function description of corresponding function module, and details are not described herein.

Using integrated unit, Figure 15 shows data transmission device involved in above-described embodiment A kind of possible structural schematic diagram.Data transmission device 150 may include：Processing module 1501, communication module 1502.Handle mould Block 1501 is for carrying out control management to the movement of data transmission device 150, for supporting data transmission device 150 to execute Figure 10 In process S1001.Communication module 1502 is also used to support the communication of data transmission device 150 Yu other network entities, it is used for Data transmission device 150 is supported to execute the process S1002 to S1004 in Figure 10.Data transmission device 150 can also include storage Module 1503, for storing data program code and data of transmitting device 150.

Wherein, processing module 1501 can be the processor in the entity structure of data transmission device 40 shown in Fig. 4 401, it can be processor or controller.Such as can be CPU, and general processor, DSP, ASIC, FPGA or other are programmable Logical device, transistor logic, hardware component or any combination thereof.It may be implemented or execute to disclose in conjunction with the application Various illustrative logic blocks, module and circuit described in content.Processor 1501 is also possible to realize computing function Combination, such as combined comprising one or more microprocessors, DSP and the combination of microprocessor etc..Communication module 1502 can be with For the transceiver 404 in the entity structure of data transmission device 40 shown in Fig. 4, communication module 1502 can be communication port, Or can be transceiver, transmission circuit or communication interface etc..Memory module 1503 can be data transmission device shown in Fig. 4 Memory 402 in 40 entity structure.

When processing module 1501 is processor, communication module 1502 is transceiver, when memory module 1503 is memory, this Apply for that data transmission device 150 involved in embodiment Figure 15 can be data transmission device 40 shown in Fig. 4.

It has been observed that device, the data transmission device of determining transmission time delay difference provided by the embodiments of the present application can be used for reality It applies the method that each embodiment of above-mentioned the application is realized and illustrates only part relevant to the embodiment of the present application for ease of description, It is disclosed by specific technical details, please refer to each embodiment of the application.

Through the above description of the embodiments, it is apparent to those skilled in the art that, for description It is convenienct and succinct, only the example of the division of the above functional modules, in practical application, can according to need and will be upper It states function distribution to be completed by different functional modules, i.e., the internal structure of device is divided into different functional modules, to complete All or part of function described above.

In several embodiments provided herein, it should be understood that disclosed device and method can pass through it Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the module or unit It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components It may be combined or can be integrated into another device, or some features can be ignored or not executed.Another point, it is shown or The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit It closes or communicates to connect, can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown can be a physical unit or multiple physical units, it can and it is in one place, or may be distributed over Multiple and different places.Some or all of unit therein can be selected to realize this embodiment scheme according to the actual needs Purpose.

It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of software functional units.

If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product When, it can store in a read/write memory medium.Based on this understanding, the technical solution of the embodiment of the present invention is substantially The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words It embodies, which is stored in a storage medium, including some instructions are used so that an equipment (can be list Piece machine, chip etc.) or processor (processor) perform all or part of the steps of the method described in the various embodiments of the present invention. And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), arbitrary access are deposited The various media that can store program code such as reservoir (Random Access Memory, RAM), magnetic or disk.

The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Change or replacement in the technical scope disclosed by the present invention, should be covered by the protection scope of the present invention.Therefore, this hair Bright protection scope should be based on the protection scope of the described claims.

Claims

1. a kind of method of determining transmission time delay difference, which is characterized in that applied to the target BS of joint transmission, the target base Any one base station at least two base stations stood as joint transmission in addition to Reference BTS, the Reference BTS are joint transmission Any of at least two base stations base station；The method includes：

Using uplink time delay measuring technique, the uplink delay, τ of acquisition user equipment (UE) to the target BS_UL；Wherein, institute State τ_ULFor the data feedback channel delay, τ of the target BS_RxWith the path delay of time τ of the UE to the target BS_PathSum；Institute State any one UE that UE is described at least two base stations united transmission；

Obtain the τ_ULWith the uplink delay, τ of the UE to Reference BTS '_ULUplink delay inequality Δ t_UL；

Obtain the difference DELTA t of the uplink and downlink channel time delay difference of the target BS and the Reference BTS_Re；Wherein, the target The uplink and downlink channel time delay difference of base station is the down going channel delay, τ of the target BS_TxSubtract the τ_Rx；

By the Δ t_ULWith the Δ t_ReIt is added, obtains the UE to the target BS and the UE to the Reference BTS Downlink transfer delay inequality Δ t_DL。

2. the method according to claim 1, wherein described by the Δ t_ULWith the Δ t_ReIt is added, obtains Downlink transfer delay inequality Δ t of the UE to the target BS and the UE to the Reference BTS_DLLater, the method is also Including：

Pilot frequency sequence after sending compensation linear phase to the UE on sub-carrierkFor carrying out channel survey Amount；Wherein, the r (k) is the preset target BS corresponding pilot frequency sequence on sub-carrierk in channel measurement pilot frequency； The k is the positive integer more than or equal to 0；

Receive wave beam forming vector w (k) of the target BS in the subcarrier k of the UE transmission；

Compensated data are sent to the UE on the subcarrier kWherein, the s (k) is the mesh Base station is marked on the subcarrier k to the traffic sequence to be sent of the UE, the w ' is target BS described in the w (k) Send the corresponding element of port port of the s (k).

3. method according to claim 1 or 2, which is characterized in that described to obtain the τ_ULWith the UE to Reference BTS Uplink delay, τ '_ULUplink delay inequality Δ t_UL, including：

It is interacted with the Reference BTS, obtains the τ '_UL；Wherein, the τ '_ULThe uplink time delay is used by the Reference BTS Measuring technique measurement obtains；

Calculate the τ_ULSubtract the τ '_UL, obtain the Δ t_UL。

4. method according to claim 1 or 2, which is characterized in that described to obtain the τ_ULWith the UE to Reference BTS Uplink delay, τ '_ULUplink delay inequality Δ t_UL, including：

The τ is fed back to central node_UL, at least two base station connection of the central node and joint transmission；

It is interacted with the central node, obtains the Δ t that the central node calculates_UL。

5. method according to claim 1-4, which is characterized in that described to obtain the target BS and the base The difference of the uplink and downlink channel time delay difference of quasi- base station, including：

Therefrom radio-frequency information reads the uplink and downlink channel time delay difference τ of the target BS_Tx-τ_Rx；

It is interacted with the Reference BTS, obtains the uplink and downlink channel time delay difference τ ' of the Reference BTS_Tx-τ′_Rx；

Calculate the Δ t_Re=(τ_Tx-τ_Rx)-(τ′_Tx-τ′_Rx)。

6. method according to claim 1-4, which is characterized in that described to obtain the target BS and the base The difference of the uplink and downlink channel time delay difference of quasi- base station, including：

The τ is fed back to central node_Tx-τ_Rx；

It is interacted with the central node, obtains the Δ t that the central node calculates_Re=(τ_Tx-τ_Rx)-(τ′_Tx-τ′_Rx)。

7. method according to claim 1-4, which is characterized in that described to obtain the target BS and the base The difference DELTA t of the uplink and downlink channel time delay difference of quasi- base station_Re, including：

The first reciprocity measuring signal is sent to the Reference BTS, the target BS is obtained for Reference BTS measurement and arrives The delay, τ of the Reference BTS_1to2；

The second reciprocity measuring signal that the Reference BTS is sent is received, measurement obtains the Reference BTS to the target BS Delay, τ_2to1；

Therefrom radio-frequency information reads the difference DELTA τ of the target BS actual uplink channel time delay Yu Measurement channel time delay_Rx, receive The actual uplink channel time delay for the Reference BTS that the Reference BTS is sent and the difference DELTA τ ' of Measurement channel time delay_Rx；

Calculate the Δ t_Re=(τ_1to2-τ_2to1)-(Δτ_Rx-Δτ′_Rx)。

8. a kind of device of determining transmission time delay difference, which is characterized in that described device is deployed in the target BS of joint transmission, institute Any one base station at least two base stations that target BS is joint transmission in addition to Reference BTS is stated, the Reference BTS is Any of at least two base stations of joint transmission base station；Described device includes：

Measuring unit obtains the uplink of user equipment (UE) to the target BS for using uplink time delay measuring technique Delay, τ_UL；Wherein, the τ_ULFor the data feedback channel delay, τ of the target BS_RxWith the UE to the path of the target BS Delay, τ_PathSum；The UE is any one UE of described at least two base stations united transmission；

Acquiring unit, for obtaining the τ of the measuring unit measurement_ULWith the uplink time delay of the UE to Reference BTS τ′_ULUplink delay inequality Δ t_UL；

The acquiring unit is also used to, and obtains the difference of the uplink and downlink channel time delay difference of the target BS and the Reference BTS Δt_Re；Wherein, the uplink and downlink channel time delay difference of the target BS is the down going channel delay, τ of the target BS_TxSubtract institute State τ_Rx；

Computing unit is used for the Δ t_ULWith the Δ t_ReIt is added, obtains the UE and arrived to the target BS and the UE The downlink transfer delay inequality Δ t of the Reference BTS_DL。

9. device according to claim 8, which is characterized in that described device further includes：

Transmission unit, for the pilot frequency sequence after sending compensation linear phase to the UE on sub-carrierkWith In progress channel measurement；Wherein, the r (k) is that the preset target BS corresponds on sub-carrierk in channel measurement pilot frequency Pilot frequency sequence；The k is the positive integer more than or equal to 0；

Receiving unit, for receiving wave beam forming vector w (k) of the target BS in the subcarrier k of the UE transmission；

The transmission unit is also used to, and sends compensated data to the UE on the subcarrier kIts In, the s (k) be the target BS on the subcarrier k to the traffic sequence to be sent of the UE, the w ' is described Target BS described in w (k) sends the corresponding element of port port of the s (k).

10. device according to claim 8 or claim 9, which is characterized in that the acquiring unit is specifically used for：

Calculate the τ_ULSubtract the τ '_UL, obtain the Δ t_UL。

11. device according to claim 8 or claim 9, which is characterized in that the acquiring unit is specifically used for：

12. according to the described in any item devices of claim 8-11, which is characterized in that the acquiring unit is specifically used for：

Calculate the Δ t_Re=(τ_Tx-τ_Rx)-(τ′_Tx-τ′_Rx)。

13. according to the described in any item devices of claim 8-11, which is characterized in that the acquiring unit is specifically used for：

The τ is fed back to central node_Tx-τ_Rx；

14. according to the described in any item devices of claim 8-11, which is characterized in that the acquiring unit is specifically used for：

Calculate the Δ t_Re=(τ_1to2-τ_2to1)-(Δτ_Rx-Δτ′_Rx)。

15. a kind of device of determining transmission time delay difference, which is characterized in that the device of the determining transmission time delay difference includes processing Device, memory and output unit；The memory is for storing computer executed instructions, when the dress of the determining transmission time delay difference When setting operation, processor calls the computer executed instructions of the memory storage, and perform claim requires 1-7 described in any item Method.

16. a kind of computer readable storage medium, which is characterized in that the computer readable storage medium includes instruction, when it When being run on base station, so that the base station executes the method according to claim 1 to 7.